CAP binds as a homodimer to specific DNA sequences upstream of genes involved in the metabolism of sugar, but only when the protein is complexed with cAMP. CAP activates transcription by contacting RNA polymerase. Identify the regions of the protein that are responsible for dimerization, DNA binding, and cAMP binding.
A. Dimerization (1), DNA binding (4), cAMP binding (3)
B. Dimerization (4), DNA binding (6), cAMP binding (5)
C. Dimerization (4), DNA binding (1), cAMP binding (3)
D. Dimerization (6), DNA binding (1), cAMP binding (2)